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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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concrete lintels which way up?
I bought two concrete lintels today,
2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] |
#2
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concrete lintels which way up?
On 15/05/2012 14:12, george [dicegeorge] wrote:
I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] The pretensioned reinforcing steel in the lintels is off-centre and is intended to be fitted closer to the bottom edge (the edge in tension). |
#3
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concrete lintels which way up?
On 15/05/12 14:20, Phil wrote:
On 15/05/2012 14:12, george [dicegeorge] wrote: I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] The pretensioned reinforcing steel in the lintels is off-centre and is intended to be fitted closer to the bottom edge (the edge in tension). look at them the measurements are 35-30 and 55-45 to the centres on the 65mm and 100mm sides. But shall i put them horizontal, or vertical with a gap between or buy a third lintel and put them vertical? [george] |
#4
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concrete lintels which way up?
On 15/05/2012 14:34, george [dicegeorge] wrote:
On 15/05/12 14:20, Phil wrote: On 15/05/2012 14:12, george [dicegeorge] wrote: I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] The pretensioned reinforcing steel in the lintels is off-centre and is intended to be fitted closer to the bottom edge (the edge in tension). look at them the measurements are 35-30 and 55-45 to the centres on the 65mm and 100mm sides. But shall i put them horizontal, or vertical with a gap between or buy a third lintel and put them vertical? [george] They are only designed to go one way up - you need to find out where the reinforcing is fitted (look at the ends & you may see two raised 'bumps') and point this to the bottom. |
#5
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concrete lintels which way up?
george [dicegeorge] wrote:
I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. they are 65mm for a reason, and that is so that it covers the same thickness as one course of brick, also, the 100mm edge is the same width as a brick, so it's fairly straightforward, without examining the reinforcing which way they go on the wall |
#6
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concrete lintels which way up?
On 15/05/2012 14:41, Phil wrote:
On 15/05/2012 14:34, george [dicegeorge] wrote: On 15/05/12 14:20, Phil wrote: On 15/05/2012 14:12, george [dicegeorge] wrote: I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] The pretensioned reinforcing steel in the lintels is off-centre and is intended to be fitted closer to the bottom edge (the edge in tension). look at them the measurements are 35-30 and 55-45 to the centres on the 65mm and 100mm sides. But shall i put them horizontal, or vertical with a gap between or buy a third lintel and put them vertical? [george] They are only designed to go one way up - you need to find out where the reinforcing is fitted (look at the ends & you may see two raised 'bumps') and point this to the bottom. Or check with a magnet. The short side will be vertical. TBH the only time I used one I didn't realise about the reinforcing and it worked OK. I *think* you will find that you lay the bricks on the "poured" surface (because the other three are potentially visible). |
#7
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concrete lintels which way up?
On May 15, 2:12*pm, "george [dicegeorge]"
wrote: I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical * it feels to me that they'd be stronger. advice please... [george] They are designed to fit long axis horizontal. They are pre- stressed. They only support the triangle of blockwork on top. The strength is all in the steel wire rope inside. It is high tensile steel. Usually the wire is in the centre. If it is offset, put it towards the bottom. Don't worry. I never heard of one of these breaking. |
#8
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concrete lintels which way up?
On May 15, 5:56*pm, newshound wrote:
On 15/05/2012 14:41, Phil wrote: On 15/05/2012 14:34, george [dicegeorge] wrote: On 15/05/12 14:20, Phil wrote: On 15/05/2012 14:12, george [dicegeorge] wrote: I bought two concrete lintels today, 2.4m x 100mm x 65mm on top of which i plan to build a double brick wall. If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. advice please... [george] The pretensioned reinforcing steel in the lintels is off-centre and is intended to be fitted closer to the bottom edge (the edge in tension).. look at them the measurements are 35-30 and 55-45 to the centres on the 65mm and 100mm sides. But shall i put them horizontal, or vertical with a gap between or buy a third lintel and put them vertical? [george] They are only designed to go one way up - you need to find out where the reinforcing is fitted (look at the ends & you may see two raised 'bumps') and point this to the bottom. Or check with a magnet. The short side will be vertical. TBH the only time I used one I didn't realise about the reinforcing and it worked OK. I *think* you will find that you lay the bricks on the "poured" surface (because the other three are potentially visible).- Hide quoted text - - Show quoted text - They are made in long lengths and cut up. You can see the wire rope in the cut end. |
#9
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concrete lintels which way up?
On Tue, 15 May 2012 14:12:09 +0100 George [dicegeorge] wrote :
If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. No, as others have said, the 100mm side should be horizontal. There's not a huge amount of strength in the lintel on its own. They're designed to work in conjunction with brickwork over, the lintel providing the tension and the brickwork the compression zone. See http://www.robeslee.co.uk/typea.htm Lintel on its own, 1.2m span, SWL 3.86kN/m, with 2 courses of brickwork over 9.50; 5 courses 20.21 -- Tony Bryer, Greentram: 'Software to build on', Melbourne, Australia www.greentram.com |
#10
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concrete lintels which way up?
On 15/05/12 23:18, Tony Bryer wrote:
On Tue, 15 May 2012 14:12:09 +0100 George [dicegeorge] wrote : If I put them with the 100mm sides horizontal then the bricks will fit neatly on top, But if the 100m sides were vertical it feels to me that they'd be stronger. No, as others have said, the 100mm side should be horizontal. There's not a huge amount of strength in the lintel on its own. They're designed to work in conjunction with brickwork over, the lintel providing the tension and the brickwork the compression zone. See http://www.robeslee.co.uk/typea.htm Lintel on its own, 1.2m span, SWL 3.86kN/m, with 2 courses of brickwork over 9.50; 5 courses 20.21 i didnt realise that - maybe i should use steel, maybe get building control maybe get a surveyor... but i haven't planned exactly what i'm going to do on top of it... thanks. [george] |
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